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Let \(p<q\), where \(p\) and \(q\) are real numbers. Which of the following transformations necessarily reverses the inequality sign?

Answer and explanation

Correct answer: Multiplying both sides by \(-5\)

When both sides of an inequality are multiplied or divided by a negative number, the inequality sign reverses. Therefore, multiplying \(p<q\) by \(-5\) gives \(-5p>-5q\). Adding the same number to both sides or dividing by a positive number does not change the sign. Exam tip: Always reverse the inequality sign when multiplying or dividing by a negative quantity.

Related tags

Linear InequalitiesInequality RulesReal NumbersOne Variable AlgebraSign ReversalAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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